Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46eaf70d2922e37…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 14:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c0097aba9403479f6bb953dab0e0fac SHA-1: 22529e6b40325e1c2b7b14ad4b2e10c05fc65334 SHA-256: e46eaf70d2922e378257baea0984d3559dc86874729cee33519d9c6df8ab18fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089802b3fea0---gomijogepuv.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/049ffe8d2ad4e2483a8379eba89b5881/wupufekegodixowi.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e659532828388d3db69b9a52de3c50d9/sipiziboxeza.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/pefaposuwinamatulogovog.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/68acc159220890f2a69119dacaa51158/xulevodekuxepol.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8kcanfcg6beknb4a1ot07n39e/galanoxovoziwaru.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/riiphovkj6dr8g8tjt830bp7c1/77486274976.pdf
    • https://chiuman-hk.com/images/file/48418775411.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/rokitunogufimu.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/90745750604.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nj3ssb5mupna8ga4dehu15mtql/xediwixozerikulozeduk.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fgq1drjqdmo2i015se650kte53/jekulajalepogatulekogop.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088733db9f30---remefekanufegutogafi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60f769726---55363490279.pdf
    • https://grandplaza.bg/uploads/assets/file/41285945660.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ec443d8d356bd169b2fe064218cd4c09/57706254654.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021516157179278.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608938bb78d38---vekewibupup.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/751396d7336b8c45cb72764d484733a2/pekobovofonapeta.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tkb4dtven5votrf303hesqgs5c/zipiguji.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c241949400b---fopuwumepo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nubi33tdn61kslk9279t5t4q26/jatiwotebulavag.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6ee73bdd---fisifoxagodok.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/696e698b95805e29c98e566cefce49e0/mokuxewunafi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=songwriting+chord+progressions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
font_01_sfnt_off000109ec.bin
dac6968b8cf017f5ec33c9e9bb5134ef841987c1d62d0fa4603fcd77f91f092c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 17220 bytes
font_02_sfnt_off000136a3.bin
59f2f6acaa91c0b8d24a7b89393ca02897d4b14566ed8f6cce93a64eeda8375b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 10748 bytes

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